For the parser, this entity has the same effect as
specifying a declared value of ‘CDATA’. For the user and the
application program, however, ‘%ISO-date;’ documents an additional restriction on the legal content for this element.
The most prominent examples of this declared value type are the
value attribute of the <docDate> element in the core tag
set, and the
date attribute of the <admin> element in the base tag
set for terminology.
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